The current date and time is
<ul>
	<li>{$smarty.now|date_format:"%Y-%m-%d %H:%M:%S"} (y-m-d format)</li>
	<li>{$smarty.now|date_format:"%d/%m/%Y %H:%M:%S"} (dd/mm/yyyy format)</li>
</ul>
This is an example of the html_select_date function (start_year = 1900, end_year = 2100):
<form>
{html_select_date start_year=1900 end_year=2100}
</form>

This is an example of the html_select_time function (AM-PM format): 
<form>
{html_select_time use_24_hours=false}
</form>

This is an example of the html_select_time function (24h format): 
<form>
{html_select_time use_24_hours=true}
</form>